diff --git a/components/style/values/specified/color.rs b/components/style/values/specified/color.rs
index 6de2464d470..c5288cb1f6b 100644
--- a/components/style/values/specified/color.rs
+++ b/components/style/values/specified/color.rs
@@ -316,8 +316,12 @@ pub enum SystemColor {
     Captiontext,
     #[parse(aliases = "-moz-field")]
     Field,
+    /// Used for disabled field backgrounds.
+    #[parse(condition = "ParserContext::in_ua_or_chrome_sheet")]
+    MozDisabledfield,
     #[parse(aliases = "-moz-fieldtext")]
     Fieldtext,
+
     Graytext,
     Highlight,
     Highlighttext,
@@ -382,6 +386,10 @@ pub enum SystemColor {
     #[parse(condition = "ParserContext::in_ua_or_chrome_sheet")]
     MozButtonactiveface,
 
+    /// Used for button background when disabled.
+    #[parse(condition = "ParserContext::in_ua_or_chrome_sheet")]
+    MozButtondisabledface,
+
     /// Background color of chrome toolbars in active windows.
     MozMacChromeActive,
     /// Background color of chrome toolbars in inactive windows.